Exchange-Interchange Carrier Interfaces – Individual Channel Signaling Protocols
|Publication Date:||1 July 1991|
This standard is one of a series of interface compatibility specifications prepared by the Services, Architecture, and Signaling Technical Subcommittee of Committee T1. The series provides technical requirements for the interfacing of cellular mobile carriers (CMCs), wireline exchange carriers (ECs), Inter exchange carriers (ICs), international carriers (INCs), and consolidated carriers in paired interface combinations. In the remainder of this standard, unless otherwise noted, (1) the term IC connotes IC, INC, or consolidated carrier, and (2) INC connotes INC or consolidated carrier.
This standard provides technical requirements for an Exchange-Inter exchange (E-l) Interface that interconnects a switching system in the EC network with a switching system in the IC network. The interface is at a point of termination (POT) between the two switching systems.
By arranging the E-l interface specifications in this standard into a number of individual signaling protocols, this standard provides the interconnecting ECs and ICs with a variety of compatible signaling to choose from to provide telecommunications services. The telecommunications services provided, and, therefore, the specific E-I interface signaling protocols available at the interface, are determined by EC and IC business decisions, mutual EC and IC interface agreements, and legal and regulatory requirements. These decisions, agreements, and requirements are beyond the scope of this technical interface signaling protocol standard.
The purpose of this standard is to enable separate entities to provide interconnecting equipment that will operate compatibly. Quantitative descriptions are provided in this standard of the specific signaling characteristics of the interconnecting systems required to achieve this purpose.
Since this standard is a technical E-l interface specification intended to only specify standard E-l interface signaling capabilities, it is beyond the scope and purpose of this standard to describe or specify EC or IC telecommunications services; to specify the particular E-I interface signaling protocols that are used or not used with any EC or IC telecommunications service: or to specify the performance of the telecommunications services provided using the E-l interface signaling protocols specified in this standard. The telecommunications services performance aspects of call completion delay due to multiple operators and the outpulsing of the charge field (see 5.7 and 5.9) are for further study.